From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Date: Wed, 8 Feb 2023 11:13:10 +0000 (+0100)
Subject: driver core: add local subsys_get and subsys_put functions
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=789be03a600842ef461968cc5a2d458f51f319b2;p=linux.git

driver core: add local subsys_get and subsys_put functions

We need to control the reference count of the subsys private structure
instead of directly manipulating the kset reference count of it, so wrap
that logic up in a subsys_get() and subsys_put() function to make it more
obvious as to what is happening.

Cc: "Rafael J. Wysocki" <rafael@kernel.org>
Link: https://lore.kernel.org/r/20230208111330.439504-2-gregkh@linuxfoundation.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/drivers/base/base.h b/drivers/base/base.h
index 0e806f6410790..9e06c18c7a644 100644
--- a/drivers/base/base.h
+++ b/drivers/base/base.h
@@ -57,6 +57,19 @@ struct subsys_private {
 };
 #define to_subsys_private(obj) container_of_const(obj, struct subsys_private, subsys.kobj)
 
+static inline struct subsys_private *subsys_get(struct subsys_private *sp)
+{
+	if (sp)
+		kset_get(&sp->subsys);
+	return sp;
+}
+
+static inline void subsys_put(struct subsys_private *sp)
+{
+	if (sp)
+		kset_put(&sp->subsys);
+}
+
 struct driver_private {
 	struct kobject kobj;
 	struct klist klist_devices;